Muffler.



G. C. HICKS, JR.

MUEPLBR.

APPLIGATION FILED JUNE 19, 1909.

Patented NOV. 2, 1909.

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JW' WO wgm UNITED STATES PATENT OFFICE.

GEORGE C. HICKS, JR., 0F CONNERSVILLE, INDIANA, ASSIGNOB T0 THE P. H. & F. M. BOOTS COMPANY, 0F CONNEBSVILLE, INDIANA.

MUFFLEB.

Speoinnation of Letters Patent.

Patented Nov. 2, 1909.

To all lwhom 'it may concern:

Be it known that I, GEORGE C. HICKS, Jr., a citizen of the United States, residing at Connersville, Fayette county, Indiana, have invented certain new and useful Improvements in Muiliers, of vwhich the following is a s ecication.

he present invention relates to sound mufliing devices and has been designed with special reference to deadening the noise from t e exhaust of rotary air exhausters employed in connection with vacuum cleaning plants in rivate residences though, of course, the evice is applicable to other situations.

In connection with the'exhaust of rotary blowers it is found that much of the noise Ais due to the intermittent withdrawal from the atmos here of air to reenter the a aratus imme iately after the discharge, t 1s rentering of the air sometimes occurring against a pressure considerably below atmospheric pressure. The present device has been found very efficient.

The invention will be readily understood from the following description taken in connection with the accompanying drawing in which Figure 1 is a lan of my improved muffier, partsbeing roken away and a wall aparlng in'horizontal section in the lane of ine c of Figs. 2 and 3: Fig. 2 a vert1cal diametricalsection of the muffler in the plane of line a of Figs. 1 and 3: and Fig. 3 a similard'section in the plane of line b of Figs. 1 an 2;

In the drawing 1, indicates a disk forming one head of a drum-sha ed chamber: 2, a nozzle, but not a restricta nozzle, projecting therefrom: 3, exhaust connection to the nozzle: et, the first drum, the same havin the base of its peripheral wall resting on dis r 1, its top being closed by a head: 5, a second and smaller 'drum completely inclosed with-I in the first drum, nozzle 2 projecting into the second drum through an opening inthe floor thereof: 6, the ioor of the second drum set a Slight distance above the floor 1 of the first drum: 7, a narrow annular openin through t the I ioor of the second drum aroun' the noz- Zie 2: 8, a narrow space between floor 6 of the second drum and Hoor. 1 of the iirst drum,

this space being in connection with annular openin s 7 and with the annular space within the rst drum and surrounding the second drum: 9, bolts securing the second drum rmly in position in the first drum: 10, washers interposed at bolts 9 between the floors of the first and second drum and serving to maintain the space 8: 11, a nozzle projecting upwardly from the roof of the rst drum: 12, the large chamber formed within the second drum: 13, the large annular chamber formed within the first drum and surroundin the second drum: 14, a third drum simi ar to drum 5 and secured tothe roof of the first drum at some little distance above the same and having in its own floor an annular opening around the nozzle l1: 15, a fourth drum similar to drum 4 and surmounting the same and surrounding drum 14: 16, a central outlet from the top of the fourth drum': 17, boltsl extendin through the horizontal walls of the outer rums and securing the drums tightly together: and 18, bolts, arran ed similarly to bolts 9, and securing the t ird drum to the roof of the first drum.

Disregarding for the present the entire ratus with which the muiiler may be connected. When the pressure of the fluid coming to the apparatus falls to a suiciently low point then there is a regurgitation of fluid from the mufiier back to the'apparatus and this demand for fluid is satisfied, or satisfactorily satisfied by expansion ofthe fluid in chamber 12. However, along with this expansion of the fluid in'chamber 12 there is likely to be some iniiow through the restricted passages 7 and'8, this intiow coming from comparatively large chamber 13 which latter ermits of some expansion of Huid in satisgyng the draft upon it. With very rapid a ternations of high and low pressure at the exhaust of the apparatus supplying the muffler, there is a restricted flow 1n both directions through passages 7 and 8, the uctuations being largely satisfied by expansion of the fluid 1n chambers 12 and 13, the result being an outflow, at comparatively steady pressure, from nozzle 11. The up er portion of the apparatus, comprising rums 111 and 15, is practically a duplication of the lower portion, and such fluctuations in fluid pressure as may occur at the discharge from nozzle 11 are equalized by expansion in the two upper drums. The upper portion of the structure is thus cumulative of the equalizing effect of the lower portion, and it is manifest that if the iuctuations of the fluid pressure are of extreme violence, the system may be carried further by the addition of drums to the series. 4

The muffler is of a very simple and economical construction, and in .practice it is found very efiicient.

I claim 1. A muiiler comprising, a rst drum having an inlet nozzle from one of its flat walls and an outlet through its opposite Hat Wall, and a second drum entirely inclosed within the rst drum and having one of vits flat walls provided with a yrestricted annular opening surrounding said nozzle and having said fiat wall disposed a restricted distance from the nozzle-provided wall of the first drum, combined substantially as set forth.

2. A muller comprising, a first drum having an inlet nozzle from one of its fiat Walls and an outlet through its o posite fiat wall, a second drum entirely inc osed Within the first drum andhavin one of its Hat walls provided with a4 restrlcted annular opening surrounding said nozzle and having said flat wall disposed a restricted distance from the nozzle-provided Wall of the first drum, a nozzle proj ectin from the outlet of the first drum, a third rum having one of its flat walls provided with a restricted annular o enincg surrounding the last-mentioned noz- `z e an having said flat wall disposedl a restricted distance from the outlet-nozzle-carrying wall of the first drum, and a fourth drum secured to the first drum and completely inclosing the third drum and rovided with an outlet, combined substantially as set forth.

3. A muffler comprising, a first drum having an outlet through one of its flat walls, a separable flat opposite wall for said drum provided with an inlet nozzle, bolts securing said separable wall to the remainder of the drum a second drum inclosed within the first drum and having one of its fiat walls provided with a restricted annular openin surrounding said nozzle and having sai flat wall disposed a restricted distance from the nozzle-provided wall of the rst drum,

and bolts securing the second drum xedly 1n the first drum, combined substantially as set forth.

4. A muier comprising, a disk having aninlet nozzle, a first drum having one end closed by said disk and having its op osite flat Wall provided with a nozzle, a ourth drum having one end closed by a flat wall provided with an outlet and having its opposite end closed by one of the flat walls of the first drum, a pair of bolts passing through .said drums parallel with their common axis and serving to secure the two drums firmly together, a second drum disposed Within the rst drum and havin one of its fiat walls provided with a restrlcted annular openin surrounding the inlet-nozzle and having sai flat W'all disposed a restricted distance from said disk, bolts securingthe second drum` to said disk, a third drum disposed within the fourth drum and having 1n one of its fiat walls a restricted opening around the outlet nozzle from the first drum and having said wall disposed a restricted distance from the outlet-provided wall of the rst drum, and bolts securin the third drum to the outlet-provided wal of the first drum, combined substantially as-set forth.

5. A muffler comprising a first drum havingflat side walls with an inlet nozzle in one of said walls and an outlet nozzle in the other `of said walls and a second drum entirely inclosed within the first drum, said second drum being entirely closed except forl an opening in one of its side Walls and disposed withln the first drum with the openin surrounding the inlet nozzle and the wall provided with the opening arranged in close relation to the wall carrying lthe inlet nozzle.

6. A muffler comprising a first drum having an inlet nozzle on one of the flat walls thereof and an outlet in the opposite Hat wall, a second drum entirely inclosed within the first drum and having an openin in the bottom thereof of larger size than t e nozzleso as to provide an annular s ace between the nozzle andthe edge of t e opening, the bottom wall of the second drum belng spaced from the wall of the rst drum to provide a continuous passage from the annular space aforesaid, and the top of the second drum bein spaced from the opposite wall of the st drum to provide an escape passage to the outlet of the first 7. A muiller comprising a first drum having an inlet nozzle on one of the flat walls thereof and an outlet passage on the opposite flat Wall, a second drum entirely inclosed Within the first drum having an opening in the bottom thereof of larger size than thel nozzle to rovide a restricted annular space between t e nozzle and the edge of the opening, the bottom wall of the second drum l 21e-carrying wall of the first drum, and a being spaced from the wall of the first drum fourth drum completely surrounding the to provide a continuous passage 4from the third drum and provided with an outlet.

annular space aforesaid, a third drum hav- 'GEORGE C. HICKS, JR. ing one of itsA Hat Walls provided with an Witnesses: opening surrounding the outlet nozzle and E. D. JOHNSTON,

said Wall being spaced from the outlet noz- J. M. SHADE. 

